1# SPDX-License-Identifier: GPL-2.0 2# 3# Copyright 2019 Google LLC. 4 5import binascii 6import gdb 7 8from linux import constants 9from linux import cpus 10from linux import rbtree 11from linux import utils 12 13timerqueue_node_type = utils.CachedType("struct timerqueue_node").get_type() 14hrtimer_type = utils.CachedType("struct hrtimer").get_type() 15 16 17def ktime_get(): 18 """Returns the current time, but not very accurately 19 20 We can't read the hardware timer itself to add any nanoseconds 21 that need to be added since we last stored the time in the 22 timekeeper. But this is probably good enough for debug purposes.""" 23 tk_core = gdb.parse_and_eval("&tk_core") 24 25 return tk_core['timekeeper']['tkr_mono']['base'] 26 27 28def print_timer(rb_node, idx): 29 timerqueue = utils.container_of(rb_node, timerqueue_node_type.pointer(), 30 "node") 31 timer = utils.container_of(timerqueue, hrtimer_type.pointer(), "node") 32 33 function = str(timer['function']).split(" ")[1].strip("<>") 34 softexpires = timer['_softexpires'] 35 expires = timer['node']['expires'] 36 now = ktime_get() 37 38 text = " #{}: <{}>, {}, ".format(idx, timer, function) 39 text += "S:{:02x}\n".format(int(timer['state'])) 40 text += " # expires at {}-{} nsecs [in {} to {} nsecs]\n".format( 41 softexpires, expires, softexpires - now, expires - now) 42 return text 43 44 45def print_active_timers(base): 46 curr = base['active']['rb_root']['rb_leftmost'] 47 idx = 0 48 while curr: 49 yield print_timer(curr, idx) 50 curr = rbtree.rb_next(curr) 51 idx += 1 52 53 54def print_base(base): 55 text = " .base: {}\n".format(base.address) 56 text += " .index: {}\n".format(base['index']) 57 58 text += " .resolution: {} nsecs\n".format(constants.LX_hrtimer_resolution) 59 60 text += " .get_time: {}\n".format(base['get_time']) 61 if constants.LX_CONFIG_HIGH_RES_TIMERS: 62 text += " .offset: {} nsecs\n".format(base['offset']) 63 text += "active timers:\n" 64 text += "".join([x for x in print_active_timers(base)]) 65 return text 66 67 68def print_cpu(hrtimer_bases, cpu, max_clock_bases): 69 cpu_base = cpus.per_cpu(hrtimer_bases, cpu) 70 jiffies = gdb.parse_and_eval("jiffies_64") 71 tick_sched_ptr = gdb.parse_and_eval("&tick_cpu_sched") 72 ts = cpus.per_cpu(tick_sched_ptr, cpu) 73 74 text = "cpu: {}\n".format(cpu) 75 for i in range(max_clock_bases): 76 text += " clock {}:\n".format(i) 77 text += print_base(cpu_base['clock_base'][i]) 78 79 if constants.LX_CONFIG_HIGH_RES_TIMERS: 80 fmts = [(" .{} : {} nsecs", 'expires_next'), 81 (" .{} : {}", 'hres_active'), 82 (" .{} : {}", 'nr_events'), 83 (" .{} : {}", 'nr_retries'), 84 (" .{} : {}", 'nr_hangs'), 85 (" .{} : {}", 'max_hang_time')] 86 text += "\n".join([s.format(f, cpu_base[f]) for s, f in fmts]) 87 text += "\n" 88 89 if constants.LX_CONFIG_TICK_ONESHOT: 90 fmts = [(" .{} : {}", 'nohz_mode'), 91 (" .{} : {} nsecs", 'last_tick'), 92 (" .{} : {}", 'tick_stopped'), 93 (" .{} : {}", 'idle_jiffies'), 94 (" .{} : {}", 'idle_calls'), 95 (" .{} : {}", 'idle_sleeps'), 96 (" .{} : {} nsecs", 'idle_entrytime'), 97 (" .{} : {} nsecs", 'idle_waketime'), 98 (" .{} : {} nsecs", 'idle_exittime'), 99 (" .{} : {} nsecs", 'idle_sleeptime'), 100 (" .{}: {} nsecs", 'iowait_sleeptime'), 101 (" .{} : {}", 'last_jiffies'), 102 (" .{} : {}", 'next_timer'), 103 (" .{} : {} nsecs", 'idle_expires')] 104 text += "\n".join([s.format(f, ts[f]) for s, f in fmts]) 105 text += "\njiffies: {}\n".format(jiffies) 106 107 text += "\n" 108 109 return text 110 111 112def print_tickdevice(td, cpu): 113 dev = td['evtdev'] 114 text = "Tick Device: mode: {}\n".format(td['mode']) 115 if cpu < 0: 116 text += "Broadcast device\n" 117 else: 118 text += "Per CPU device: {}\n".format(cpu) 119 120 text += "Clock Event Device: " 121 if dev == 0: 122 text += "<NULL>\n" 123 return text 124 125 text += "{}\n".format(dev['name']) 126 text += " max_delta_ns: {}\n".format(dev['max_delta_ns']) 127 text += " min_delta_ns: {}\n".format(dev['min_delta_ns']) 128 text += " mult: {}\n".format(dev['mult']) 129 text += " shift: {}\n".format(dev['shift']) 130 text += " mode: {}\n".format(dev['state_use_accessors']) 131 text += " next_event: {} nsecs\n".format(dev['next_event']) 132 133 text += " set_next_event: {}\n".format(dev['set_next_event']) 134 135 members = [('set_state_shutdown', " shutdown: {}\n"), 136 ('set_state_periodic', " periodic: {}\n"), 137 ('set_state_oneshot', " oneshot: {}\n"), 138 ('set_state_oneshot_stopped', " oneshot stopped: {}\n"), 139 ('tick_resume', " resume: {}\n")] 140 for member, fmt in members: 141 if dev[member]: 142 text += fmt.format(dev[member]) 143 144 text += " event_handler: {}\n".format(dev['event_handler']) 145 text += " retries: {}\n".format(dev['retries']) 146 147 return text 148 149 150def pr_cpumask(mask): 151 nr_cpu_ids = 1 152 if constants.LX_NR_CPUS > 1: 153 nr_cpu_ids = gdb.parse_and_eval("nr_cpu_ids") 154 155 inf = gdb.inferiors()[0] 156 bits = mask['bits'] 157 num_bytes = (nr_cpu_ids + 7) / 8 158 buf = utils.read_memoryview(inf, bits, num_bytes).tobytes() 159 buf = binascii.b2a_hex(buf) 160 if type(buf) is not str: 161 buf=buf.decode() 162 163 chunks = [] 164 i = num_bytes 165 while i > 0: 166 i -= 1 167 start = i * 2 168 end = start + 2 169 chunks.append(buf[start:end]) 170 if i != 0 and i % 4 == 0: 171 chunks.append(',') 172 173 extra = nr_cpu_ids % 8 174 if 0 < extra <= 4: 175 chunks[0] = chunks[0][0] # Cut off the first 0 176 177 return "".join(chunks) 178 179 180class LxTimerList(gdb.Command): 181 """Print /proc/timer_list""" 182 183 def __init__(self): 184 super(LxTimerList, self).__init__("lx-timerlist", gdb.COMMAND_DATA) 185 186 def invoke(self, arg, from_tty): 187 hrtimer_bases = gdb.parse_and_eval("&hrtimer_bases") 188 max_clock_bases = gdb.parse_and_eval("HRTIMER_MAX_CLOCK_BASES") 189 190 text = "Timer List Version: gdb scripts\n" 191 text += "HRTIMER_MAX_CLOCK_BASES: {}\n".format(max_clock_bases) 192 text += "now at {} nsecs\n".format(ktime_get()) 193 194 for cpu in cpus.each_online_cpu(): 195 text += print_cpu(hrtimer_bases, cpu, max_clock_bases) 196 197 if constants.LX_CONFIG_GENERIC_CLOCKEVENTS: 198 if constants.LX_CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: 199 bc_dev = gdb.parse_and_eval("&tick_broadcast_device") 200 text += print_tickdevice(bc_dev, -1) 201 text += "\n" 202 mask = gdb.parse_and_eval("tick_broadcast_mask") 203 mask = pr_cpumask(mask) 204 text += "tick_broadcast_mask: {}\n".format(mask) 205 if constants.LX_CONFIG_TICK_ONESHOT: 206 mask = gdb.parse_and_eval("tick_broadcast_oneshot_mask") 207 mask = pr_cpumask(mask) 208 text += "tick_broadcast_oneshot_mask: {}\n".format(mask) 209 text += "\n" 210 211 tick_cpu_devices = gdb.parse_and_eval("&tick_cpu_device") 212 for cpu in cpus.each_online_cpu(): 213 tick_dev = cpus.per_cpu(tick_cpu_devices, cpu) 214 text += print_tickdevice(tick_dev, cpu) 215 text += "\n" 216 217 gdb.write(text) 218 219 220LxTimerList() 221